500 cities are expected to join the Compact for Mayors next year, which commits them to using the Global Protocol - the first common standard for measuring emissions.
Cities with constrained budgets want to shift to LED lighting, but the upfront costs still get in the way.
Portland State University's Urban Sustainability Accelerator has selected the first group of cities to assist in making sustainability a reality.
In his final year as mayor, he also promises to boost electric vehicles, recycling rates and resiliency in NYC.
The wide-ranging, very deep plan targets net-zero buildings, cutting energy in half and getting half of electricity from renewables.
30 cities around the world have already signed onto the City Protocol, as well as many top IT corporations.